Steam was updated a short time ago with a brand new addition to the family: the official DayZ ArmA 2 mod page. Installing the mod should now theoretically be a simple, one-click operation and one that will automatically remain up to date as patches roll out.
via N4G: pc news feed http://n4g.com/news/1178270/dayz-appears-on-steam-as-official-arma-2-mod
via N4G: pc news feed http://n4g.com/news/1178270/dayz-appears-on-steam-as-official-arma-2-mod